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Home >> Buick >> 1994 >> Roadmaster Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 33 (Engine Controls - System/Component Tests - 6.5L Diesel) >> Fuel System >> Injectors >> Opening Pressure Test

Opening Pressure Test

WARNING: This page does not describe the selected car, but rather 20 other vehicles, including the 1994 GMC Yukon, 1994 GMC Vandura Special, 1994 GMC Vandura, 1994 GMC Suburban, and 1994 GMC Rally Camper Special. However, it is still accessible from the selected car via links, so may be relevant.
  1. Open tester shutoff valve 1/4 turn from closed position. Slowly depress tester lever and observe gauge. Note pressure at which needle of pressure gauge stops. Some injector nozzles may pop while other injector nozzles may drip (this is not a leak).
  2. Injector opening pressure should not fall to less than 1500 psi (105 kg/cm2 ). Replace any injector nozzle that does not meet lowest acceptable pressure. Release tester pressure.
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